Electrode composite material, preparation method thereof, cathode and battery including the same
An electrode composite material is disclosed in the invention. The electrode composite material comprises AB x C y D z , wherein A is selected from at least one of polypyrrole, polyacrylonitrile, and polyacrylonitrile copolymer; B comprises sulfur; C is selected from carbon material; D is selected from metal oxides, l≦x≦20, 0≦y<l, and 0≦z<1. Comparing to the prior art, the conductivity of the electrode composite material is obviously increased, the material is dispersed uniformly and the size of the material is small. The electrochemical performance of the electrode composite material is improved. It has a good cycle life and high discharging capacity efficiency. A method for manufacturing the electrode composite material, a positive electrode using the electrode composite material and a battery including the same are also disclosed in the invention.
1. A heat-treated electrode composite material comprising AB x C y D z , A being selected from at least one of polyacrylonitrile and polyacrylonitrile copolymer; B is sulfur; C is a carbon based material; and D is a mixture of MgO and NiO; wherein the weight ratios of A, B, C, and D are expressed as AB x C y D z and 1<x<20, Oy<l, and 0<z<1.
2. The heat-treated electrode composite material according to claim 1 , wherein y=0.
3. The heat-treated electrode composite material according to claim 1 , wherein 0<y<1.
4. The heat-treated electrode composite material according to claim 1 , wherein A is the polyacrylonitrile copolymer and is selected from at least one of polyacrylonitrile methylmethacrylate copolymer and polyacrylonitrile polypyrrole copolymer.
5. The heat-treated electrode composite material according to claim 1 , wherein the carbon based material is selected from at least one of ketjen black, Acetylene black, active carbon, single wall carbon nano-tube, multi wall carbon nano-tube and graphene.
6. A cathode for battery, comprising a heat-treated electrode composite material, the heat-treated electrode composite material comprising AB x C y D z , A being selected from at least one of polyacrylonitrile and polyacrylonitrile copolymer; B is sulfur; C is a carbon based material; and D is a mixture of MgO and NiO; wherein the weight ratios of A, B, C, and D are expressed as AB x C y D z and 1<x<20, Oy<l, and 0<z<1.
7. The cathode for battery according to claim 6 , wherein y=0.
8. The cathode for battery according to claim 6 , wherein 0<y<1.
9. The cathode for battery according to claim 6 , wherein A is the polyacrylonitrile copolymer and is selected from at least one of polyacrylonitrile methylmethacrylate copolymer and polyacrylonitrile polypyrrole copolymer.
10. The cathode for battery according to claim 6 , wherein the carbon based material is selected from at least one of ketjen black, Acetylene black, active carbon, single wall carbon nano-tube, multi wall carbon nano-tube and graphene.
11. A battery, comprising a cathode, an anode and an electrolyte provided between the cathode and anode, the cathode comprising a cathode current collector and a heat-treated electrode composite material, the heat-treated electrode composite material comprising AB x C y D z , A being selected from at least one of polyacrylonitrile and polyacrylonitrile copolymer; B is sulfur; C is a carbon based material; and D is a mixture of MgO and NiO; wherein the weight ratios of A, B, C, and D are expressed as AB x C y D z and 1<x<20, Oy<l, and 0<z<1.
12. The battery according to claim 11 , wherein y=0.
13. The battery according to claim 11 , wherein 0<y<1.
14. The battery according to claim 11 , wherein A is the polyacrylonitrile copolymer and is selected from at least one of polyacrylonitrile methylmethacrylate copolymer and polyacrylonitrile polypyrrole copolymer.
15. The battery according to claim 11 , wherein the carbon based material is selected from at least one of ketjen black, Acetylene black, active carbon, single wall carbon nano-tube, multi wall carbon nano-tube and graphene.
16. The battery according to claim 11 , wherein the electrolyte is selected from one of polyvinylidene fluoride, polyvinylidene fluoride-poly(methyl methacrylate) copolymer, polyvinylidene fluoride-hexafluoropropylene copolymer, and polyethylene glycol boric acid ester polymers.
17. The battery according to claim 11 , wherein the cathode current collector is selected from one of aluminum foil, nickel foam, and stainless steel net.